getAppendValue

Rule specifying that `append_value` be appended to the existing value.
If the targeted cell is unset, it will be treated as containing the
empty string.

bytes append_value = 3;

getIncrementAmount

long getIncrementAmount()

Rule specifying that `increment_amount` be added to the existing value.
If the targeted cell is unset, it will be treated as containing a zero.
Otherwise, the targeted cell must contain an 8-byte value (interpreted
as a 64-bit big-endian signed integer), or the entire request will fail.